You like the scent of the shampoo so you decided to stock up a few bottles. A bottle of shampoo last for around three to four months. Therefore, in one year, you could barely buy three bottles.
What is the problem with using the same shampoo over time?
There is no scientific provings that our hair would become immune to the same shampoo. However, it is important to prevent product build-up of copper, iron, hard water minerals found in hair products, especially over prolong period of usage, like shampoo.
You could use a deep cleanse or clarifying shampoo once a week to clarify your hair then continue with your all-time-favourite shampoo. This ritual would also help in removing styling product build-up on hair, in particular if you use wax, mud, or leave-in moisturiser on a daily basis.
Love yourself, love your hair.